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					Originally Posted by  The Radium King
					 
				 
				most likely failed variocam solenoid. to confirm drain the oil and look for green rubber bits that look like this: 
 
work can be done with engine in car, but mechanic will most likely want to drop engine. lots of 'while you are in there' work to do - updated tensioners, chain tensioner pads, chains. do you want to fix both sides or just the side that failed, etc.  
			
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The picture is showing the variocam actuator, not the solenoid. Both can fail and both will throw codes but different ones. Both will require pulling the head cover.